cr request abstract

Dear Harry,

as per agreed at telecon, Dan modifed the abstract of the editor's 
draft, to that the cr-request is out of sync.
Please take appropriate action.

The additional text is:
[[
A GRDDL Test Cases document illustrates specific issues in this design 
and provides materials to aid in test-driven development of GRDDL-aware 
agents.
]]

Jeremy
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